Read only file system problem

sanjeevdrdo · 06-07-2015, 08:04 AM

After creating root file system in image file, when booted with custom kernel using QEMU, guest OS Ubuntu 15.04 does not allow to create any file.

veerain · 06-08-2015, 08:06 AM

Welcome to Linux Questions?

Is the image writable? ( ls -l fileimage ).

Is the guest OS root filesystem mounted read only?

You have to do little research on your system and provide more info before others can help.

sanjeevdrdo · 06-08-2015, 08:34 AM

The image is writable. Guest OS root filesystem is not mounted read only

veerain · 06-08-2015, 11:46 AM

So what command doesn't works.

sanjeevdrdo · 06-08-2015, 11:15 PM

Any file write.

veerain · 06-09-2015, 12:00 AM

Post output of commands:

Code:

mount
cat /proc/mounts

sanjeevdrdo · 06-09-2015, 03:56 AM

I have attached the files.

veerain · 06-09-2015, 04:40 AM

Quote:

The image is writable. Guest OS root filesystem is not mounted read only

You posted this. But the images show root fs readonly mounted. See this line:

Code:

/dev/sda on / type ext4 (ro,relatime,data=ordered)

In this 'ro' means read only.

So you have to find out why it is mounted read only and correct it.

For a temporary solution just run:

Code:

mount -t ext4 -o remount,rw /dev/sda /

Your root fs may have an entry in /etc/fstab. If it has then correct it. Otherhand the initramfs may have mounted root fs readonly.

sanjeevdrdo · 06-09-2015, 05:44 AM

As you said I added the entry in /etc/fstab which was initially empty. Now its ok. Thank you so much